CN111211687A - Hourglass-shaped impedance network boost converter and switching power supply - Google Patents

Hourglass-shaped impedance network boost converter and switching power supply Download PDF

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Publication number
CN111211687A
CN111211687A CN202010043161.4A CN202010043161A CN111211687A CN 111211687 A CN111211687 A CN 111211687A CN 202010043161 A CN202010043161 A CN 202010043161A CN 111211687 A CN111211687 A CN 111211687A
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capacitor
tube module
hourglass
switch tube
diode
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CN111211687B (en
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张桂东
陈伟琛
陈浩东
陈思哲
章云
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Guangdong University of Technology
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Guangdong University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses an hourglass-shaped impedance network boost converter and a switching power supply, wherein the gain of the hourglass-shaped impedance network boost converter is 2 (1-D)/(DxD-3D +1), the voltage stress drop of an output capacitor is 1/2 of the output voltage, the voltage stress of a first capacitor is 1/2 of the output voltage and the voltage difference of a direct-current power supply, the voltage stress of a second capacitor is 1/18-3/14 of the output voltage, the voltage stress of an energy storage capacitor and the voltage stress of the output capacitor are reduced, the size of the capacitor is favorably reduced, the size of the switching power supply is greatly reduced, a higher power density index is obtained, the problem that the voltage stress borne by the energy storage capacitor and the filter capacitor of the conventional high-gain Z-source DC-DC converter is larger is solved, and when the circuit works under the condition of higher gain, the withstand voltage of the capacitor required by the converter must be large enough, so that the volume, the weight and the cost of the capacitor are all increased, and the technical problem that the requirements of practical industrial application are difficult to meet is solved.

Description

Hourglass-shaped impedance network boost converter and switching power supply
Technical Field
The application relates to the technical field of DC-DC converters, in particular to an hourglass-shaped impedance network boost converter and a switching power supply.
Background
The DC-DC converter is widely used in electronic products such as mobile phones, digital cameras, and portable media players, and the performance of the DC-DC converter affects the performance of the entire product, and is an important device in the power electronics field.
Fig. 1 shows a conventional Z-source DC-DC converter, and fig. 1 is a schematic circuit structure diagram of the conventional Z-source DC-DC converter, which realizes boosting by controlling on and off of a switching tube module, but has a low voltage gain, and the voltage stress of an energy storage capacitor and an output filter capacitor in the circuit is high, which cannot meet the requirements of practical industrial application. Aiming at the defects of the traditional Z-source DC-DC converter, the high-gain Z-source DC-DC converter shown in FIG. 2 is provided in the field, FIG. 2 is a schematic diagram of the circuit structure of the traditional high-gain Z-source DC-DC converter, and compared with the traditional Z-source DC-DC converter, a diode and a filter capacitor are added in the scheme of FIG. 2, so that the boosting capacity of the circuit is improved, but the voltage stress borne by the energy storage capacitor and the filter capacitor is still not reduced, so that the withstand voltage of the capacitor required by the converter is large enough, the volume, the weight and the cost of the capacitor are increased, and the requirements of practical industrial application are difficult to meet.
Disclosure of Invention
The application provides an hourglass-shaped impedance network boost converter and a switching power supply, which are used for solving the technical problems that the voltage stress borne by an energy storage capacitor and a filter capacitor of the existing high-gain Z-source DC-DC converter is large, and when a circuit works under the condition of high gain, the withstand voltage of the capacitor required by the converter must be large enough, so that the volume, the weight and the cost of the capacitor are increased, and the requirements of practical industrial application are difficult to meet.
In view of the above, the present application provides, in a first aspect, an hourglass-shaped impedance network boost converter, including: the circuit comprises a direct-current power supply, an hourglass-shaped impedance network, a second switch tube module, a third capacitor, a fourth capacitor, a third diode, a fourth diode and a load;
the hourglass-shaped impedance network comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode, a second diode and a first switch tube module;
the first end of the second switch tube module is connected with the negative end of the direct current power supply and the cathode of the third diode;
the second end of the second switch tube module is connected with the first end of the second capacitor, one end of the second inductor, the first end of the third capacitor and the second end of the fourth capacitor;
a second end of the third capacitor is connected with an anode of the third diode and a negative end of the load;
the first end of the first switch tube module is connected with the other end of the second inductor, the anode of the fourth diode and the cathode of the first diode;
the second end of the first switch tube module is connected with the first end of the first capacitor and the cathode of the second diode;
the anode of the second diode is connected with the first end of the second capacitor;
a first end of the fourth capacitor is connected with a cathode of the fourth diode and a positive end of the load;
one end of the first inductor is connected with the positive end of the direct-current power supply and the second end of the first capacitor;
the other end of the first inductor is connected with the second end of the second capacitor and the anode of the first diode.
Optionally, the first switch tube module and the second switch tube module are turned on or off simultaneously.
Optionally, the first switch tube module and the second switch tube module are both IGBT tubes;
the first ends of the first switch tube module and the second switch tube module are emitting electrodes of the IGBT tubes, and the second ends of the first switch tube module and the second switch tube module are collecting electrodes of the IGBT tubes.
Optionally, the first switching tube module and the second switching tube module are both NMOS tubes;
the first ends of the first switch tube module and the second switch tube module are the source electrodes of the NMOS tubes, and the second ends of the first switch tube module and the second switch tube module are the drain electrodes of the NMOS tubes.
Optionally, the first switch tube module and the second switch tube module are both a single switch tube.
Optionally, the first switch tube module and the second switch tube module are both more than two switch tube strings connected in parallel;
each switching tube string comprises more than two switching tubes which are connected in series.
Optionally, the first capacitor, the second capacitor and the third capacitor are all polar capacitors;
the first end of the first capacitor, the first end of the second capacitor and the first end of the third capacitor are positive terminals;
the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are negative terminals.
Optionally, inductance values of the first inductor and the second inductor are equal.
Optionally, the inductance values of the first inductor and the second inductor are 220 μ H;
the capacitance values of the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all 47 muF.
A second aspect of the present application provides a switching power supply comprising an hourglass-shaped impedance network boost converter as described in any one of the first aspects.
According to the technical scheme, the embodiment of the application has the following advantages:
an hourglass impedance network boost converter is provided herein, comprising: the circuit comprises a direct-current power supply, an hourglass-shaped impedance network, a second switch tube module, a third capacitor, a fourth capacitor, a third diode, a fourth diode and a load; the hourglass-shaped impedance network comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode, a second diode and a first switch tube module; the first end of the second switching tube module is connected with the negative end of the direct-current power supply and the cathode of the third diode; the second end of the second switch tube module is connected with the first end of the second capacitor, one end of the second inductor, the first end of the third capacitor and the second end of the fourth capacitor; the second end of the third capacitor is connected with the anode of the third diode and the negative end of the load; the first end of the first switch tube module is connected with the other end of the second inductor, the anode of the fourth diode and the cathode of the first diode; the second end of the first switch tube module is connected with the first end of the first capacitor and the cathode of the second diode; the anode of the second diode is connected with the first end of the second capacitor; the first end of the fourth capacitor is connected with the cathode of the fourth diode and the positive end of the load; one end of the first inductor is connected with the positive end of the direct-current power supply and the second end of the first capacitor; the other end of the first inductor is connected with the second end of the second capacitor and the anode of the first diode.
The hourglass-shaped impedance network boost converter provided by the application has the advantages that the gain is 2 (1-D)/(DxD-3D +1), the voltage stress of an output capacitor is reduced to 1/2 of the output voltage constantly, the voltage stress of a first capacitor is constantly the difference value between 1/2 of the output voltage and the voltage of a direct-current power supply, the voltage stress of a second capacitor is 1/18-3/14 of the output voltage, the voltage stress of an energy storage capacitor and the voltage stress of the output capacitor are reduced, the size of the capacitor is favorably reduced, the size of a switching power supply is greatly reduced, and a high power density index is obtained, so that the problem that the voltage stress borne by the energy storage capacitor and the filter capacitor of the conventional high-gain Z-source DC-DC converter is large is solved, and when a circuit works under the condition of high gain, the withstand voltage of the capacitor required by the converter must be large enough, the volume, the weight and the cost of the capacitor are all increased, and the technical problem that the requirements of practical industrial application are difficult to meet is solved.
Drawings
FIG. 1 is a schematic circuit diagram of a conventional Z-source DC-DC converter;
FIG. 2 is a schematic circuit diagram of a conventional high-gain Z-source DC-DC converter;
fig. 3 is a schematic circuit diagram of an hourglass-shaped impedance network boost converter provided in an embodiment of the present application;
fig. 4 is a circuit diagram illustrating an operation of the hourglass-shaped impedance network boost converter provided in the embodiments of the present application when both the first switching tube module and the second switching tube module are turned on;
fig. 5 is a circuit diagram illustrating the operation of the hourglass-shaped impedance network boost converter provided in the embodiments of the present application when both the first switching tube module and the second switching tube module are turned off;
FIG. 6 is a schematic diagram of a gain curve of an hourglass impedance network boost converter provided in an embodiment of the present application;
FIG. 7 is a simulated waveform diagram of an hourglass impedance network boost converter with a duty cycle of 0.32 provided in an embodiment of the present application;
wherein:
Vinis a DC power supply S1Is a first switch tube module S2Is a second switch tube module D1Is a first diode, D2Is a second diode, D3Is a third diode, D4Is a fourth diode, C1Is a first capacitor, C2Is a second capacitor, C3Is a third capacitor, C4Is a fourth capacitor, L1Is a first inductor, L2Is the second inductance and R is the load.
Detailed Description
The embodiment of the application provides an hourglass-shaped impedance network boost converter and a switching power supply, and is used for solving the technical problems that the voltage stress borne by an energy storage capacitor and a filter capacitor of an existing high-gain Z-source DC-DC converter is large, and when a circuit works under the condition of high gain, the withstand voltage of a capacitor required by the converter must be large enough, so that the volume, the weight and the cost of the capacitor are increased, and the requirements of actual industrial application are difficult to meet.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
To facilitate understanding, referring to fig. 3, the present application provides one embodiment of an hourglass impedance network boost converter comprising: DC power supply VinHourglass-shaped impedance network and second switch tube module S2A third capacitor C3A fourth capacitor C4A third diode D3A fourth diode D4And a load R;
the hourglass-shaped impedance network comprises a first inductor L1A second inductor L2A first capacitor C1A second capacitor C2A first diode D1A second diode D2And a first switch tube module S1；
Second switch tube module S2Is connected with a direct current power supply VinAnd the cathode of the third diode;
second switch tube module S2Second end of (2) is connected toConnected with a second capacitor C2First terminal, second inductance L2One terminal of (C), a third capacitor C3First terminal and fourth capacitor C4A second end of (a);
third capacitor C3Is connected to a third diode D3And the negative terminal of the load R;
first switch tube module S1Is connected to the second inductor L2Another terminal of (1), a fourth diode D4And the first diode D1A cathode of (a);
first switch tube module S1Is connected with the first capacitor C1First terminal and second diode D2A cathode of (a);
second diode D2Anode of is connected with a second capacitor C2A first end of (a);
fourth capacitor C4Is connected with a fourth diode D4And the positive terminal of the load R;
first inductance L1One end of the DC power supply V is connected withinAnd the first capacitor C1A second end of (a);
first inductance L1Is connected with a second capacitor C2Second terminal and first diode D1Of (2) an anode.
It should be noted that the hourglass-type impedance network boost converter in the embodiment of the present application includes two operation modes according to the on and off of the switching tube module, please refer to fig. 4 and 5, and the dotted line portion in fig. 4 and 5 is a non-operation portion, which may be regarded as being absent. The operation principle of the hourglass-shaped impedance network boost converter in the embodiment of the present application can be described as follows:
when the first switch tube module S1And a second switch tube module S2When all are conducted:
first switch tube module S1A second switch tube module S2And a fourth diode D4An on, first diode D1A second diode D2And a third diode D3A second capacitor C for receiving the reverse voltage and cutting off2And a DC power supply VinBy means of "DC power supply VinFirst inductance L1-a first capacitance C1A second switch tube module S2Loop pair first inductance L1Charging, first inductance L1The current of (2) increases linearly;
a first capacitor C1And a DC power supply VinBy means of "DC power supply Vin-a first capacitance C1First switch tube module S1A second inductance L2A second switch tube module S2Loop pair second inductance L2Charging, second inductance L2The current of (2) increases linearly;
a first capacitor C1And a DC power supply VinBy means of "DC power supply Vin-a first capacitance C1First switch tube module S1A fourth diode D4-a fourth capacitance C4A second switch tube module S2"Loop to fourth capacitance C4Charging;
third capacitor C3Through a "third capacitor C3-a fourth capacitance C4The load R "circuit provides energy to the load R.
When the first switch tube module S1And a second switch tube module S2When all are turned off:
first switch tube module S1And a second switch tube module S2Off, fourth diode D4Is reversely cut off by being subjected to back voltage, the first diode D1A second diode D2And a third diode D3On, the first inductor L1Through a "first inductance L1First diode D1A second inductance L2A second diode D2-a first capacitance C1Loop pair second capacitance C2Charging, first inductance L1The current of (2) decreases linearly;
second inductance L2Through a "first inductance L1A second inductance L2A second diode D2-a first capacitance C1Loop pair first capacitance C1Charging, second inductance L2The current of (2) decreases linearly;
DC power supply VinBy means of "DC power supply VinFirst inductance L1-a second capacitance C2-a third capacitance C3-a third diode D3"Loop to third capacitance C3Charging;
fourth capacitor C4Through a "fourth capacitor C4-load R-third capacitance C3"provide energy to the load R.
The ratio of the on-time DT to the period time T in one period of the switch tube module is a duty ratio D, and in an actual DC-DC converter, the actual value of the duty ratio D is not more than 0.5.
The gain of the hourglass-shaped resistive network boost converter, the voltage stress of the output capacitor, and the voltage stress of the capacitors in the impedance network in the embodiments of the present application are analyzed below.
In one period of the switch tube module S, the output voltage (namely the voltage of the direct current load R) of the hourglass-type impedance network boost converter is V0D.C. power supply VinHas a voltage of VinAnd then:
when the first switch tube module S1And a second switch tube module S2When all are switched on, the following are provided:
first inductance L1Voltage V ofL1Comprises the following steps:
VL1＝Vin+VC2；
wherein, VC2Is a second capacitor C2Voltage of, first inductance L1The current of (2) increases linearly.
Second inductance L2The voltage of (a) is:
VL2＝Vin+VC1；
wherein, VC1Is a first capacitor C1Voltage of, second inductance L2The current of (2) increases linearly.
At this time, the output voltage V of the hourglass-shaped impedance network boost converteroComprises the following steps:
Vo＝VC3+VC4；
while
VC4＝VL2。
When the first switch tube module S1And a second switch tube module S2When all are turned off:
first inductance L1The voltage of (a) is:
VL1＝VC2-VC1；
second inductance L2The voltage of (a) is:
VL2＝-VC2；
at this time, the output voltage V of the hourglass-shaped impedance network boost converteroComprises the following steps:
Vo＝VC3+VC4；
while
VC3＝Vin+VC1；
When the circuit is in steady state, the voltage is controlled by VL1＝Vin+VC2、VL2＝Vin+VC1、VL1＝VC2-VC1、VL2＝-VC2And a first inductance L1A second inductor L2The principle of volt-second equilibrium of (1) is as follows:
Figure BDA0002368454750000081
Figure BDA0002368454750000082
the two equations are combined and solved to obtain:
Figure BDA0002368454750000083
Figure BDA0002368454750000084
from VC4＝VL2And VC3＝Vin+VC1Obtaining:
Figure BDA0002368454750000085
Figure BDA0002368454750000086
then by Vo＝VC3+VC4And Vo＝VC3+VC4The following can be obtained:
Figure BDA0002368454750000087
the gain G of the hourglass-shaped impedance network boost converter in the embodiment of the present application is:
Figure BDA0002368454750000088
fig. 6 is a graph illustrating the gain G of an hourglass-shaped impedance network boost converter in an embodiment of the present application.
According to
Figure BDA0002368454750000089
And
Figure BDA00023684547500000810
the following can be obtained:
Figure BDA00023684547500000811
according to
Figure BDA0002368454750000091
And
Figure BDA0002368454750000092
the following can be obtained:
Figure BDA0002368454750000093
the value range of the duty ratio D in the embodiment of the application is 0.12-0.32, so that the problems of burning and inductance saturation caused by overhigh heating of a switching tube due to high duty ratio of a traditional booster circuit can be solved, and the circuit works in a safer and more stable state.
As can be seen from the above equation, the boost multiple is only related to the duty ratio D, and the DC power supply VinAnd under the determined condition, the required direct current output voltage can be obtained by changing the duty ratio D. A first capacitor C 11/2 with constant voltage stress as output voltage and DC power supply VinDifference in voltage, second capacitor C2The voltage stress of the third capacitor C is 1/18-3/14 of the output voltage3And a fourth capacitance C4The withstand voltage is 1/2 of the output voltage. Third capacitor C3And a fourth capacitance C4All are below half of the output voltage, the voltage stress of the energy storage capacitor and the output capacitor is reduced, and the third capacitor C3And a fourth capacitance C4The series connection of (a) results in a doubling of the output voltage compared to a single capacitor.
Therefore, in the hourglass-shaped impedance network boost converter provided in the embodiment of the application, the gain is 2 (1-D)/(DxD-3D +1), the voltage stress drop of the output capacitor is 1/2 of the output voltage constantly, and the first capacitor C 11/2 with constant voltage stress as output voltage and DC power supply VinDifference in voltage, second capacitor C2The voltage stress is 1/18-3/14 of output voltage, the voltage stress of an energy storage capacitor and the voltage stress of an output capacitor are reduced, the reduction of the volume of the capacitor is facilitated, the volume of a switching power supply is greatly reduced, and a high power density index is obtained, so that the technical problems that the voltage stress borne by the energy storage capacitor and the filter capacitor of the existing high-gain Z-source DC-DC converter is large, when a circuit works under the condition of high gain, the withstand voltage of the capacitor needed by the converter must be large enough, the volume, the weight and the cost of the capacitor are increased, and the requirement of actual industrial application is difficult to meet are solved.
In the high-gain Z-source DC-DC converter circuit in FIG. 2, the capacitor C in the Z-source impedance network1And a capacitor C2The voltage of (a) is:
Figure BDA0002368454750000094
capacitor C3The voltage of (a) is:
Figure BDA0002368454750000095
output capacitor C4The voltage of (a) is:
Figure BDA0002368454750000101
combined stand
Figure BDA0002368454750000102
And
Figure BDA0002368454750000103
the following can be obtained:
Figure BDA0002368454750000104
Figure BDA0002368454750000105
the duty ratio range of the normal work of the switch tube module of the high-gain Z-source DC-DC converter circuit in the figure 2 is 0.1-0.4, namely the capacitor C of the switch tube module1And a capacitor C2All the borne voltages are output voltages V thereofo' 3/8-9/19, capacitor C3The voltage born is the output voltage Vo' 10/19-5/8, capacitor C4Subjected to a voltage equal to its output voltage Vo'。
Therefore, the hourglass-shaped impedance network boost converter provided in the embodiment of the application realizes great reduction of the voltage stress of the capacitor under the condition that only one diode and one switching tube are added, and meanwhile, the duty ratio range of normal operation of the hourglass-shaped impedance network boost converter is smaller under the condition that the boost capacity is the same.
In order to verify the hourglass-shaped impedance network boost converter in the embodiment of the present application, a simulation circuit as shown in fig. 3 may be further built in the embodiment of the present application, wherein simulation parameters are set as:
L1＝L2＝220μH
C1＝C2＝C3＝C4＝47μF
Vin＝20V
R＝300Ω
when the duty cycle is 0.32, the simulation result at this time is shown in fig. 7, the output voltage of the hourglass-shaped impedance network boost converter is 189.5V, the gain is 9.475, and the gain curve is in accordance with fig. 6.
As a further improvement to the hourglass impedance network boost converter in the embodiment of the present application, the first switch tube module S of the hourglass impedance network boost converter in the embodiment of the present application1And a second switch tube module S2Simultaneously on or simultaneously off.
It should be noted that the first switch tube module S1And a second switch tube module S2Simultaneously on or off, a first switch tube module S1And a second switch tube module S2The ratio of the on-time DT to the period time T in one period of (D) is the duty cycle D.
As a further improvement to the hourglass impedance network boost converter in the embodiment of the present application, the first switch tube module S of the hourglass impedance network boost converter in the embodiment of the present application1And a second switch tube module S2Are all IGBT tubes;
first switch tube module S1And a second switch tube module S2The first end of the first switch tube module S is an emitting electrode of an IGBT tube1And a second switch tube module S2The second end of the IGBT is a collector of the IGBT tube.
It should be noted that an IGBT (Insulated Gate Bipolar Transistor) is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (Bipolar junction diode) and an MOS (Insulated Gate field effect Transistor), and has both the advantages of high input impedance of the MOSFET and low on-state voltage drop of the GTR.
As a further improvement to the hourglass impedance network boost converter in the embodiment of the present application, the first switch tube module S of the hourglass impedance network boost converter in the embodiment of the present application1And a second switch tube module S2NMOS tubes are arranged;
first switch tube module S1And a second switch tube module S2The first end of the first switch tube module S is a source electrode of an NMOS tube1And a second switch tube module S2The second end of the NMOS tube is the drain electrode of the NMOS tube.
It should be noted that, besides the IGBT and the NMOS in the embodiment of the present application, a person skilled in the art may replace the switching tube with another type of switching tube according to an actual use situation on the basis of the embodiment of the present application, and the switching tube of the switching tube module is not limited specifically herein.
As a further improvement to the hourglass impedance network boost converter in the embodiment of the present application, the first switch tube module S of the hourglass impedance network boost converter in the embodiment of the present application1And a second switch tube module S2Are all single switch tubes.
In the practical application process, if the current in the boosting process is small, the switch tube module can be composed of only one switch tube, so that the cost is saved, the circuit structure of the hourglass-shaped impedance network boosting converter is simplified, a control and driving circuit is easy to realize, and the application of the hourglass-shaped impedance network boosting converter in the industry is facilitated.
As a further improvement to the hourglass impedance network boost converter in the embodiment of the present application, the first switch tube module S in the hourglass impedance network boost converter in the embodiment of the present application1And a second switch tube module S2More than two parallel switch tube strings are arranged;
each switching tube string comprises more than two switching tubes which are connected in series.
In the practical application process, if the current in the boosting process is large, the safety of the hourglass-shaped impedance network boosting converter is improved in order to avoid damaging the switch tube module, the switch tube module can be formed by more than two switch tube strings connected in parallel, and each switch tube string comprises more than two switch tubes connected in series, so that the switching power supply is suitable for application scenes of large current and large voltage.
It is noted that the first switch tube module S1And a second switch tube module S2The gate control signals are the same, the control is simple, the technical problem of high control difficulty caused by multiple switches of the traditional high-gain converter can be solved, and the method has good industrial application prospect.
As a further improvement to the hourglass-shaped impedance network boost converter of the embodiments of the present application, the first capacitor C in the hourglass-shaped impedance network boost converter1A second capacitor C2A third capacitor C3And a fourth capacitance C4Are all polar capacitors;
a first capacitor C1First terminal, second capacitor C2First terminal of, third capacitor C3First terminal and fourth capacitor C4The first ends of the first and second switch circuits are both positive ends;
a first capacitor C1Second terminal, second capacitor C2Second terminal, third capacitor C3Second terminal and fourth capacitor C4And the second end of the switch is a negative end.
Note that, since the voltage applied to each capacitor is small relative to the output voltage, the first capacitor C is configured to receive a voltage that is smaller than the output voltage1A second capacitor C2A third capacitor C3And a fourth capacitance C4The capacitor can be selected as a non-polar capacitor, so that the service life of the converter can be prolonged.
Considering that the application scenes of the DC-DC converter in practical application are not in high voltage and high power, but the capacity of the polar capacitor is relatively large, and the polar capacitor can be applied to the occasions of high voltage and high power, the first capacitor C can be used1A second capacitor C2A third capacitor C3And a fourth capacitance C4Are all selected to be polar capacitors. The value can be obtained by those skilled in the art according to the actual application situation, and is not specifically limited herein.
Embodiments of a switching power supply comprising any of the aforementioned embodiments of an hourglass-shaped impedance network boost converter are provided herein.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. An hourglass-shaped impedance network boost converter, comprising: the circuit comprises a direct-current power supply, an hourglass-shaped impedance network, a second switch tube module, a third capacitor, a fourth capacitor, a third diode, a fourth diode and a load;
the hourglass-shaped impedance network comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode, a second diode and a first switch tube module;
the first end of the second switch tube module is connected with the negative end of the direct current power supply and the cathode of the third diode;
the second end of the second switch tube module is connected with the first end of the second capacitor, one end of the second inductor, the first end of the third capacitor and the second end of the fourth capacitor;
a second end of the third capacitor is connected with an anode of the third diode and a negative end of the load;
the first end of the first switch tube module is connected with the other end of the second inductor, the anode of the fourth diode and the cathode of the first diode;
the second end of the first switch tube module is connected with the first end of the first capacitor and the cathode of the second diode;
the anode of the second diode is connected with the first end of the second capacitor;
a first end of the fourth capacitor is connected with a cathode of the fourth diode and a positive end of the load;
one end of the first inductor is connected with the positive end of the direct-current power supply and the second end of the first capacitor;
the other end of the first inductor is connected with the second end of the second capacitor and the anode of the first diode.
2. The hourglass impedance network boost converter of claim 1, wherein the first switching tube module and the second switching tube module are turned on or off simultaneously.
3. The hourglass impedance network boost converter of claim 1, wherein said first switching tube module and said second switching tube module are both IGBT tubes;
the first ends of the first switch tube module and the second switch tube module are emitting electrodes of the IGBT tubes, and the second ends of the first switch tube module and the second switch tube module are collecting electrodes of the IGBT tubes.
4. The hourglass impedance network boost converter of claim 1, wherein said first switching tube module and said second switching tube module are NMOS tubes;
the first ends of the first switch tube module and the second switch tube module are the source electrodes of the NMOS tubes, and the second ends of the first switch tube module and the second switch tube module are the drain electrodes of the NMOS tubes.
5. The hourglass impedance network boost converter of claim 3 or 4, wherein the first switching tube module and the second switching tube module are each a single switching tube.
6. The hourglass impedance network boost converter of claim 3 or 4, wherein the first switching tube module and the second switching tube module are both two or more parallel switching tube strings;
each switching tube string comprises more than two switching tubes which are connected in series.
7. The hourglass impedance network boost converter of claim 1, wherein said first, second, third and fourth capacitors are polar capacitors;
the first end of the first capacitor, the first end of the second capacitor, the first end of the third capacitor and the first end of the fourth capacitor are positive terminals;
the second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are all negative terminals.
8. The hourglass impedance network boost converter of claim 1, wherein the inductance values of said first inductor and said second inductor are equal.
9. The hourglass impedance network boost converter of claim 8, wherein said first inductor and said second inductor have an inductance value of 220 μ H;
the capacitance values of the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all 47 muF.
10. A switching power supply comprising an hourglass impedance network boost converter as claimed in any one of claims 1 to 9.
CN202010043161.4A 2020-01-15 2020-01-15 Hourglass-shaped impedance network boost converter and switching power supply Active CN111211687B (en)

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